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How to find the valve to a specific zone

My system has 6 zones. Zone 1 to zone 4 are in the front yard. Zone 5 and zone 6 are in the backyard. Zone 6 will never stop running if I don't shut the water valve off manually inside a green rectangular box in the front yard. In the front yard there is a round green box in which I can see the wiring and a component that I don't know what it is. I also saw a similar round green box in the backyard but I am not sure at this moment. I will either replace or clean the Zone 6 valve to solve the problem. My current question is: how can I locate the valve in zone 6? Your replies will be appreciated.